A place to put those random ideas that you don't plan on using just yet, but won't leave you alone unless you write some of it down.
This is a place to put random scraps of writing, things that pop into my mind without having a story to belong to. For me they can be a great distraction, as my my keeps wandering back to them instead of focusing on the story at hand. Scenes, characters, dialogue, or even just the description of a location... if I need to get it out of my head and don't know if I'm ever going to go back to it, this is a place to put it.
If anybody else wants to join in, feel free. :)